Jesus is not the brother of Satan
He is God
When I'm told my beliefs are not biblical, I have to take a step back and ask myself, "Hmmm... What Bible do they read? Every belief I have is supported by the Bible."
But, it is of no use to argue with them. First of all, because contention is of the Devil. Second of all, I don't think they know what my beliefs are. Finally, I don't think they've read the Bible, but are echoing what someone else or some website has told them.
I'm thankful for the restoration of the Gospel of Jesus Christ. It was taught anciently in the House of the Lord, or as in the case of the painting below, in the portable Tabernacle. That same Gospel is taught today in temples around the world. Every teaching comes straight from the Bible, and is witnessed in other scriptures along with latter-day prophets and apostles.